Uploaded July 2022 | Updated September 2026, 1 week ago
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Screw gauge is an instrument that is used to measure small lengths with accuracy greater than a Vernier Caliper. It is also known as Micrometer Screw Gauge. If it is required to take measurement precis than a Vernier Calipers then one can use Screw Gauge.
Construction:
A simple screw gauge consists of a U-shaped metal frame with a metal stud at its one end
A hollow cylinder (or sleeve) has a millimeter scale over it along a line called index line parallel to its axis.
The hollow cylinder acts as a nut. It is fixed at the end of U-shaped frame opposite to the stud.
A Thimble has a threaded spindle inside it. As the thimble completes one rotation, the spindle moves 1 mm along the index line. It is because the distance between consecutive threads on the spindle is 1 mm. This distance is called the pitch of screw on the spindle.
The thimble has 100 divisions around its one end. It is the circular scale of the screw gauge.
Follow the steps to take reading:
First check for Zero Error close the Screw Gauge using Ratchet. If the zero line of the Circular Scale coincide with the zero of Main Scale then there will be no zero error.
Now place the object between Spindle and Stud and lock it for taking reading.
Now check the Main Scale Reading by counting the lines on the main scale.
Now for the Circular Scale Reading check which line is coinciding with the Index line, multiply it with Least Count.
Add both the readings i.e. Main Scale Reading and Circular Scale Reading multiplied by Least Count.
Don't hesitate to send me an email for any comments, suggestion, guidance, support or even online lessons.
Write an email at : thephysicspartner@gmail.com
Screw gauge is an instrument that is used to measure small lengths with accuracy greater than a Vernier Caliper. It is also known as Micrometer Screw Gauge. If it is required to take measurement precis than a Vernier Calipers then one can use Screw Gauge.
Construction:
A simple screw gauge consists of a U-shaped metal frame with a metal stud at its one end
A hollow cylinder (or sleeve) has a millimeter scale over it along a line called index line parallel to its axis.
The hollow cylinder acts as a nut. It is fixed at the end of U-shaped frame opposite to the stud.
A Thimble has a threaded spindle inside it. As the thimble completes one rotation, the spindle moves 1 mm along the index line. It is because the distance between consecutive threads on the spindle is 1 mm. This distance is called the pitch of screw on the spindle.
The thimble has 100 divisions around its one end. It is the circular scale of the screw gauge.
Follow the steps to take reading:
First check for Zero Error close the Screw Gauge using Ratchet. If the zero line of the Circular Scale coincide with the zero of Main Scale then there will be no zero error.
Now place the object between Spindle and Stud and lock it for taking reading.
Now check the Main Scale Reading by counting the lines on the main scale.
Now for the Circular Scale Reading check which line is coinciding with the Index line, multiply it with Least Count.
Add both the readings i.e. Main Scale Reading and Circular Scale Reading multiplied by Least Count.
